Does the house have smart meters or the old style. If the old type the output of the panels is fed back into the mains and you are paid for that. Any power you draw will have to be paid for. If smart meters are fitted the panel output is fed back into the circuits for the house for you to use free. Excess power generated is then fed back into the mains and you get paid a pittance for it. If your load exceeds the panels supply, you draw from the mains and you pay for it. If smart meters are fitted be careful. Each 24 hours is divided into usage zones. Evening zones are the most expensive power. Overnight is the cheapest and the day has a couple of zones which vary in power cost. Talk to the providers to see what they offer.


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